Power busbar connection tool

ABSTRACT

The invention relates to an electric device, especially to a power busbar connection tool, said tool comprises an electric motor drive unit, an electric control unit, a stationary portion removably connects to a busbar, a movable portion removably connects to a busbar and a loading portion for clamping connecting rods. Said movable portion is movably connected to a first and second stationary shaft of said stationary portion, said movable portion is connected to a movable shaft by a screw pair, said movable portion is fixedly connected to said electric motor drive unit, said movable shaft is driven to rotate around its axis by said electric motor drive unit, said loading portion is movably connected to said second stationary shaft and slides between a body of said stationary portion and a body of said movable portion, said loading portion rotates around said second stationary shaft. It is achieved that a plurality of connecting rods are simultaneously mounted to busbars and that two busbars are connected in a form of butt-and-butt connecting.

RELATED APPLICATION

This application is a U.S. National Phase of International PatentApplication No. PCT/CN2017/087635 filed on Jun. 8, 2017, which claimspriority benefit of Chinese Patent Application No. 201710229170.0 filedon Apr. 10, 2017. Each of the above-referenced applications is herebyincorporated herein by reference in its entirety.

FIELD OF THE INVENTION

The invention relates to an electric device, especially to a powerbusbar connection tool.

DESCRIPTION OF PRIOR ART

In a field of power distribution, partly overlapping two busbars isusually used to be a manner of a connection between two busbas, thenusing bolts and nuts to fasten them. As this manner required, there is acertain length of two busbars needed to overlap for keeping a currentdensity of a touching surface within a normal range of values so as tomake the connecting part meet requirements of related standards. Inorder to keep a low temperature rising of an electric device, usually alength of overlapping is increased for increasing a touching surface soas to reduce a current density thereof. However, increasing the lengthof overlapping may increase amounts of busbars resulted in increasingcost. Electric clearance or phase distance between busbars may bereduced as a result of bolts used for fastening, in order not to reducethe electric clearance or phase distance, a distance between busbarsneeds to be increased, however increasing the distance necessarilyenlarge an occupation space of busbars. How to increase a touchingsurface for reducing a temperature rising not resulted in reducingelectric clearance or phase distance or enlarging occupation space ofbusbars, there is a new manner of connecting busbars to solve the aboveproblem, busbars are connected in a form of butt-and-butt connecting viaconnecting rods, see FIG. 21.

SUMMARY OF THE PRESENT INVENTION

The object of the invention is to provide a tool used to mountconnecting rods to busbars for connecting busbars in a form ofbutt-and-butt connecting.

Such object is achieved by providing a power busbar connection tool asdefined in claim 1. Further advantageous according to the invention willbe apparent from the dependent claims.

The invention provides a power busbar connection tool, said toolcomprises an electric motor drive unit and an electric control unitconnected with an electrical power input; said tool further comprises astationary portion removably connected to a busbar, a movable portionremovably connected to a busbar and a loading portion for clampingconnecting rods. Said movable portion is movably connected to a firstand second stationary shaft of said stationary portion, said movableportion is connected to a movable shaft by a screw pair, said movableportion is fixedly connected to said electric motor drive unit of saidstationary portion, said movable shaft is driven to rotate around itsaxis by said electric motor drive unit, said loading portion is movablyconnected to said second stationary shaft of said stationary portion andslides between a body of said stationary portion and a body of saidmovable portion, said loading portion rotates around said secondstationary shaft.

Said stationary portion comprises said first stationary shaft, saidsecond stationary shaft parallel to said first stationary shaft, saidmovable shaft parallel to said first stationary shaft, a firststationary plate perpendicular to and fixedly connected to said firstand second stationary shaft, a second stationary plate perpendicular toand fixedly connected to said first and second stationary shaft, saidelectric motor drive unit arranged between said first and secondstationary plate, a third stationary plate perpendicular to and fixedlyconnected to said first and second stationary shaft, a fourth stationaryplate perpendicular to and fixedly connected to said first and secondstationary plate, a first positioning pillar arranged to said fourthstationary plate for inserting into a positioning hole of a busbar. Saidmovable shaft is fixedly connected to a rotating shaft of said electricmotor drive unit by a coupler. Said movable portion comprises a seventhstationary plate, a fifth stationary plate perpendicular to and fixedlyconnected to said seventh stationary plate, a sixth stationary plateperpendicular to and fixedly connected to said seventh stationary plate,a second positioning pillar arranged to said seventh stationary platefor inserting into a positioning hole of a busbar, a screw nut arrangedto said fifth stationary plate for coupling with a screw portion of saidmovable shaft, a clamping portion for clamping a busbar arranged betweensaid fifth and sixth stationary plate and through said seven stationaryplate, a limiting portion arranged to said seven stationary plate forlimiting said clamping portion to move. Said loading portion comprisestwo movable plates which respectively open or close with respect to anaxis of said second stationary shaft, said movable plate comprises areceiving cavity for receiving connecting rods. Said first and secondstationary shaft of said stationary portion penetrate through saidmovable portion, an end of said movable shaft of said stationary portionrotatably connects to said third stationary plate, said movable portionslides between said third and first stationary plate of said stationaryportion, said second stationary shaft of said stationary portionpenetrates through said loading portion, which slides between said fifthstationary plate of said movable portion and said first stationary plateof said stationary portion and rotates around said second stationaryshaft, said fifth stationary plate is parallel to said sixth stationaryplate (29).

Said stationary portion further comprises a first heating portionarranged to said fourth stationary plate for heating a busbar, saidfirst heating portion movably connects to said fourth stationary plateto adjust a distance between said first heating portion and a busbar.Said movable portion further comprises a second heating portion arrangedto said seventh stationary plate for heating a busbar, said secondheating portion movably connects to said seventh stationary plate toadjust a distance between said second heating portion and a busbar.

Said stationary portion further comprises a supporting portion forsupporting a loading portion, a supporting end of said supportingportion penetrates through a first stationary plate, a length of saidsupporting end protruding from said first stationary plate (14) isadjusted by a sliding block of said supporting portion.

Said limiting portion comprises a base, a straight pin which has aninterference fit with said base, a limiting end for partly insertinginto said base, a spring for replacing said limiting end, a side coverfixedly connected to said limiting end and a ball head for operating.Said side cover is fastened to said base by snap-fits, said limiting endcomprises a tooth for meshing with a teeth groove of said clampingportion, said tooth comprises a recess for matching with said straightpin, operating said ball head is to release meshing between said toothand said teeth groove of said clamping portion, said spring acts on saidtooth to make said tooth mesh with said teeth groove.

Said first stationary shaft is fixedly connected to said firststationary plate by a straight pin, said second stationary shaft isfixedly connected to said first stationary plate by a straight pin, saidmovable shaft is rotatably connected to said first stationary plate by asleeve, said first stationary shaft is fixedly connected to said secondstationary plate by a straight pin, said second stationary shaft isfixedly connected to said second stationary plate by a straight pin.

Said first stationary shaft is fixedly connected to said thirdstationary plate by a spring pin, said second stationary shaft isfixedly connected to said third stationary plate by a spring pin, saidmovable shaft is rotatably connected to said third stationary plate by asleeve.

The invention also provides a power busbar connection tool, said toolcomprises a pneumatic motor drive unit and an electric control unitconnected with an electrical power input; said tool further comprises astationary portion removably connected to a busbar, a movable portionremovably connected to a busbar and a loading portion for clampingconnecting rods. Said movable portion is movably connected to a firstand second stationary shaft of said stationary portion, said movableportion is connected to a movable shaft by a screw pair, said movableportion is fixedly connected to said pneumatic motor drive unit of saidstationary portion, said movable shaft is driven to rotate around itsaxis by said pneumatic motor drive unit, said loading portion is movablyconnected to said second stationary shaft of said stationary portion andslides between a body of said stationary portion and a body of saidmovable portion, said loading portion rotates around said secondstationary shaft.

The invention also provides a power busbar connection tool, said toolcomprises an hydraulic motor drive unit and an electric control unitconnected with an electrical power input; said tool further comprises astationary portion removably connected to a busbar, a movable portionremovably connected to a busbar and a loading portion for clampingconnecting rods. Said movable portion is movably connected to a firstand second stationary shaft of said stationary portion, said movableportion is connected to a movable shaft by a screw pair, said movableportion is fixedly connected to said hydraulic motor drive unit of saidstationary portion, said movable shaft is driven to rotate around itsaxis by said hydraulic motor drive unit, said loading portion is movablyconnected to said second stationary shaft of said stationary portion andslides between a body of said stationary portion and a body of saidmovable portion, said loading portion rotates around said secondstationary shaft.

Advantageous Effects

1. It is achieved that a plurality of connecting rods are simultaneouslymounted to busbars and that two busbars are connected in a form ofbutt-and-butt connecting.

2. A movable portion comprises a clamping portion and a secondpositioning pillar, while a stationary portion comprises a firstpositioning pillar, such arrangement benefits that a second busbar iscapable to adjust its position before connecting till a second busbar,connecting rods and a first busbar are totally aligned with one another.Each product needs to adjust its position according to site conditionwhen they are in an assemble process, because accuracy in busbarassemble site is not very high. A second busbar and a connecting toolcan be seen as one whole part because of a movable portion clamping asecond basbar, this whole part can rotate around an axis of a firstpositioning pillar, also can move along an axis of a first positioningpillar, a second busbar can slide along a stationary shaft of astationary portion when it is clamped by a movable portion. Therefore, asecond busbar is capable to adjust its position before connecting till asecond busbar, connecting rods and a first busbar are totally alignedwith one another, such arrangement improves tool's adaptability toworking condition.

3. Each of a movable portion and a stationary portion comprises ahandle, which comprises buttons having the same functions, only when twohands all hold handles and simultaneously active relative buttons,relative functions of tool can work, such arrangement avoids harm tosafety when connecting busbars.

4. A supporting end is telescopic to solve a storage problem after aloading portion finishing mounting connecting rods, two movable platesare supported by a supporting end to make a loading portion get out ofbusbars connecting path so as to avoid busbars sticking a loadingportion when connecting busbars, it is good to connect busbars.

5. Open-or-close loading portion is slideable along a second stationaryshaft and also rotatable around a second stationary shaft, sucharrangement is convenient for loading connecting rods.

6. Using heating portion to heat busbars in a manner of high frequencyelectromagnetic radiation, it is an homogeneous heating to improveheating efficiency, there is no open fire at site, hidden danger isremoved to improve working conditions.

7. There is an adjustment arranged to a heating portion, so heatingportion is capable to heat different thickness of busbar, sucharrangement improves tool's adaptability to different kinds of busbars.

BRIEF DESCRIPTION OF THE DRAWING

Further characteristics and advantages of the invention will emerge fromthe description of preferred, but not exclusive embodiments of the toolaccording to the invention, non-limiting examples of which are providedin the attached drawings, in which:

FIG. 1 is a 3d-drawing of a power busbar connection tool of embodiment1, wherein a movable portion is at a first position, a loading portionis closed.

FIG. 2 is a 3d-drawing of FIG. 1 from another view, wherein a movableportion is at a second position, a loading portion is open.

FIG. 3 is a 3d-drawing of FIG. 1, wherein a shell and an electriccontrol part are removed.

FIG. 4 is a 3d-drawing of a stationary portion of FIG. 1, wherein ashell and an electric control part are removed.

FIG. 5 is a sectional 3d-drawing of a power busbar connection tool ofthe invention.

FIG. 6 is a sectional 3d-drawing of a stationary portion of FIG. 1.

FIG. 7 is an exploded 3d-drawing of a tool of FIG. 5.

FIG. 8 is a sectional 3d-drawing of a limiting portion of the invention,wherein a tooth is at a meshing status.

FIG. 9 is a sectional 3d-drawing of a limiting portion of the invention,wherein a tooth is not at a meshing status.

FIG. 10 is an exploded 3d-drawing of a limiting portion of theinvention.

FIG. 11-20 are drawings of connecting steps using a tool of embodiment1.

FIG. 21 is a sectional 3d-drawing of busbars after connecting.

FIG. 22 is a 3d-drawing of a power busbar connection tool of embodiment2.

List of reference symbols  1. stationary portion; 24. limiting portion; 2. movable portion; 25. second positioning pillar;  3. loading portion;26. second heating portion;  11. first stationary shaft; 27. clampingportion;  12. second stationary shaft; 28. seventh stationary plate; 13. movable shaft; 29. sixth stationary plate;  14. first stationaryplate; 41. side cover;  15. electric motor drive unit; 42. spring;  16.second stationary plate; 43. core rod;  17. first heating portion; 44.tooth;  18. supporting portion; 45. straight pin;  19. third stationaryplate; 46. limiting end; 110. fourth stationary plate 47. base; 111.first positioning pillar; 48. recess; 112. couper; 49. ball head;  21.screw nut;  5. air input.  22. fifth stationary plate;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

At site of connecting busbars, when it is needed to connect two busbars,one of two is already fixedly mounted, the other is movable, the movableone is taken to connect to the fixedly mounted one. The fixedly mountedbusbar is defined first busbar while the movable busbar is definedsecond busbar in the invention. It is needed to preprocess busbarsbefore connecting process, a pre-hole is arranged to a surface which isfor connecting so as to receive a connecting rod, a depth of pre-hole isslightly greater than half of connecting rod, a positioning hole isarranged to a surface which faces a tool so as to match with apositioning pillar of tool, a diameter of positioning hole is slightlygreater than a diameter of positioning pillar to have a clearance fitbetween them.

Embodiment 1

Referring to FIG. 1 and FIG. 2, a power busbar connection tool comprisesa stationary portion 1 removably connected to a busbar, a movableportion 2 removably connected to a busbar and a loading portion 3 forclamping connecting rods. Said movable portion 2 is movably connected toa first and second stationary shaft 11,12 of said stationary portion 1,said movable portion 2 is connected to a movable shaft 13 by a screwpair. Said loading portion 3 is movably connected to said secondstationary shaft 12 of said stationary portion 1 and slides between abody of said stationary portion 1 and a body of said movable portion 2.Each of said stationary and movable portion 1, 2 comprises a shell witha handle, said handle comprises a plurality of buttons connected to anelectric control unit, an electrical power input is connected to saidelectric control unit. Each of two sides of said stationary portion 1comprises a sliding block, pushing said sliding block is to make asupporting end of a supporting portion 18 protrude from or retract intosaid stationary portion 1. When said supporting end is at a protrudingstatus, said supporting end supports two movable plates of said loadingportion 3 which are at an open status, to keep said supporting portion 3at an open status is to avoid negative influence on busbars connecting.A first positioning pillar 111 is arranged to a surface of saidstationary portion 1 which is to match with a first busbar, said firstpositioning pillar 111 matches with a positioning hole preprocessed to afirst busbar so that there is no relative displacement between saidstationary portion 1 and said first busbar with respect to a lengthdirection of said first busbar when connecting busbars, that is to saythat said stationary portion 1 and said first busbar are relativelystatic when connecting blusbars. Said first positioning pillar 111withdraws from said positioning hole of said first busbar after busbarsconnecting, it is achieved that said stationary portion 1 is removablyconnected to a busbar. A first heating portion 17 is perpendicularlyarranged to a fitting side between a first busbar and said stationaryportion 1, a heating surface of said first heating portion 17 faces afirst busbar. Said first heating portion 17 heats a first busbar undercontrol of said electric control unit after activating a heating buttonof said handle. A first busbar with good electrical conductivity is in ahigh frequency alternative magnetic field created by a coils arranged insaid first heating portion 17, said first busbar heats up because ofeddy effect. A second positioning pillar 25 is arranged to a surface ofsaid movable portion 2 which is to match with a second busbar, saidsecond positioning pillar 25 matches with a positioning holepreprocessed to a second busbar so that there is no relativedisplacement between said movable portion 2 and said second busbar withrespect to a length direction of said second busbar when connectingbusbars, that is to say that said movable portion 2 and said secondbusbar are relatively static when connecting blusbars. A second heatingportion 26 is perpendicularly arranged to a fitting side between asecond busbar and said movable portion 2, a heating surface of saidsecond heating portion 26 faces a second busbar. Said second heatingportion 26 heats a second busbar under control of said electric controlunit after activating a heating button of said handle. A second busbarwith good electrical conductivity is in a high frequency alternativemagnetic field created by a coils arranged in said second heatingportion 26, said second busbar heats up because of eddy effect. Aclamping portion 27 is perpendicularly arranged to a fitting sidebetween said movable portion 2 and a second busbar, manually adjusting alength of clamping portion 27 is to clamp different width of busbars,said clamping portion 27 comprises a teeth groove, a meshing betweensaid teeth groove and a limiting portion 24 arranged in said movableportion 2 is to keep a clamping length of said clamping portion 27 so asto achieve a function of said clamping portion 27 clamping a secondbusbar, said second busbar does not secede from said movable portion 2in a connecting precess, said movable portion 2 clamps said secondbusbar to move to a first busbar which is already fixedly mounted.

A meshing between said teeth groove and said limiting portion 24 isreleased by operating a ball head 49 of said limiting portion 24 so asto release a limiting effect on said clamping portion 27 from saidlimiting portion 24, then a clamping length is manually adjusted toachieve a function of said clamping portion 27 releasing a secondbusbar, it is also achieved that said movable portion 2 is removablyconnected to a busbar. A function of said clamping portion 27 to releasesaid second busbar is achieved by a meshing between gears and said teethgroove, it is achieved that said movable portion 2 is removablyconnected to a busbar. There is an adjustment arranged to each saidfirst and second heating portion 17, 26 to be adaptable to differentthickness of busbars, high frequency alternative magnetic heating isarranged to heating portion to heat busbar quickly without open fire, itis an homogeneous heating to improve heating efficiency, there is noopen fire at site, hidden danger is removed to improve workingconditions.

Referring to FIG. 4, said stationary portion 1 comprises said firststationary shaft 11, said second stationary shaft 12 parallel to saidfirst stationary shaft 11, said movable shaft 13 parallel to said firststationary shaft 11, a first stationary plate 14 perpendicular to andfixedly connected to said first and second stationary shaft 11, 12, asecond stationary plate 16 perpendicular to and fixedly connected tosaid first and second stationary shaft 11, 12, said electric motor driveunit 15 arranged between said first and second stationary plate 14,16, acoupler 112 for connecting said electric motor drive unit 15 and saidmovable shaft 13, a third stationary plate 19 perpendicular to andfixedly connected to said first and second stationary shaft 11,12, afourth stationary plate 110 perpendicular to and fixedly connected tosaid first and second stationary plate 14, 16, a first positioningpillar 111 arranged to said fourth stationary plate 110 for insertinginto a positioning hole of a busbar, a first heating portion 17 arrangedto said fourth stationary plate 110 for heating a busbar, a supportingportion 18 for supporting a loading portion 3. An end of said movableshaft 13 is fixedly connected to a rotating shaft of said electric motordrive unit 15 by said coupler 112, said electric motor drive unit 15drives said movable shaft 13 to rotate around its axis under control ofsaid electric control unit, another end of said movable shaft 13 isrotatably connected to said third stationary plate 19 by a sleeve. Saidfirst heating portion 17 is movably connected to said fourth stationaryplate 110 to adjust a distance between said first heating portion 17 anda busbar, said first heating portion 17 heats busbar under control ofsaid electric control unit, heating manner is a high frequencyalternative magnetic heating. A supporting end of said supportingportion 18 penetrates through a first stationary plate 14, a length ofsaid supporting end protruding from said first stationary plate 14 isadjusted by a sliding block of said supporting portion 18. Said loadingportion 3 comprises two movable plates which respectively open or closewith respect to an axis of said second stationary shaft 12, said movableplate comprises a receiving cavity for receiving connecting rods and amagnetic element for keeping said loading portion 3 at a close status, adistance between each receiving cavity is identical to a distancebetween holes preprocessed to busbars. A connecting rod is clampedtightly by two movable plates when said loading portion 3 is at closestat, there is no relative displacement between said connecting rod andsaid movable plates.

Referring to FIG. 3, said movable portion 2 comprises a seventhstationary plate 28, a fifth stationary plate 22 perpendicular to andfixedly connected to said seventh stationary plate 28, a sixthstationary plate 29 perpendicular to and fixedly connected to saidseventh stationary plate 28, a second positioning pillar 25 arranged tosaid seventh stationary plate 28 for inserting into a positioning holeof a busbar, a screw nut 21 arranged to said fifth stationary plate 22for coupling with a screw portion of said movable shaft 13, a clampingportion 27 for clamping a busbar arranged between said fifth and sixthstationary plate 22, 29 and through said seven stationary plate 28, alimiting portion 24 arranged to said seven stationary plate 28 forlimiting said clamping portion 24 to move, a second heating portion 26arranged to said seventh stationary plate 28 for heating a busbar. Ateeth arranged to said clamping portion 27 meshes with a tooth 44arranged in said limiting portion 24. Said second heating portion 26 isconnected with said electric control unit, said second heating portion26 is movably connected to said seven stationary plate 28 to adjust adistance between said second heating portion 26 and a busbar, saidsecond heating portion 26 heats busbar under control of said electriccontrol unit, heating manner is a high frequency alternative magneticheating. Said fifth stationary plate 22 is parallel to said sixthstationary plate 29, said fifth stationary plate 22 comprises a sleeve,which has an interference fit with said fifth stationary plate 22 and aclearance fit with said first and second stationary shaft 11, 12. Saidelectric control unit connected to a power input is arranged to an innerside of a shell of said movable portion 2, said electric control unitelectrically connects to buttons of handles and said second heatingportion 26. Said second heating portion 26 works for a certain period oftime after activating a heating button of a handle. When said clampingportion 26 is to clamp a busbar, firstly, operating said ball head 49 ofsaid limiting portion 24 is to draw said ball head 49 away from a busbarso as to release a meshing relationship between said tooth 44 of saidlimiting portion 24 and said teeth groove of said clamping portion 27, alimiting effect on said clamping portion 27 from said limiting portion24 is released. Secondly, continue to keep said ball head 49 at a statusof drawing, meanwhile manually adjust a distance between a clamping endof clamping portion 27 and a busbar so as to make said clamping end fitwith said busbar, then release said ball head 49, said tooth 44 rebuildsa meshing relationship with said teeth groove of sand clamping portion27 as a result of a spring effect of a spring 42 arranged in saidlimiting portion 24, that is to say that a limiting effect on saidclamping portion 27 from said limiting portion 24 works, said clampingportion 27 is unmovable to keep a status of clamping a busbar. When saidclamping portion 26 is to release a busbar, firstly, operating said ballhead 49 of said limiting portion 24 is to draw said ball head 49 awayfrom a busbar so as to release a meshing relationship between said tooth44 of said limiting portion 24 and said teeth groove of said clampingportion 27, a limiting effect on said clamping portion 27 from saidlimiting portion 24 is released. Secondly, continue to keep said ballhead 49 at a status of drawing, meanwhile manually adjust a distancebetween a clamping end of clamping portion 27 and a busbar so as to makesaid clamping end away from said busbar, then release said ball head 49,said tooth 44 rebuilds a meshing relationship with said teeth groove ofsand clamping portion 27 as a result of a spring effect of a spring 42arranged in said limiting portion 24, that is to say that a limitingeffect on said clamping portion 27 from said limiting portion 24 works,said clamping portion 27 is unmovable to keep a status of releasing abusbar.

Referring to FIG. 3, said first and second stationary shaft 11, 12 ofsaid stationary portion 1 and said movable shaft 13 penetrate throughsaid movable portion 2, an end of said movable shaft 13 is fixedlyconnected to a rotating shaft of said electric motor drive unit 15 ofsaid stationary portion 1 by a coupler, said movable shaft 13 is drivento rotate around its axis by said electric motor drive unit 15. A screwpair connecting is formed between a screw nut 21 arranged to saidmovable portion 2 and a screw portion arranged to said movable shaft 13,a rotation of said movable shaft 13 drives said movable portion 2 toslide axially along said first and second stationary shaft 11, 13because said screw nut 21 is fastened to said fifth stationary plate 22of said movable portion 2, said movable portion 2 slides between saidthird and first stationary plate 19, 14 of said stationary portion 1.Said second stationary shaft 12 of said stationary portion 1 penetratesthrough said loading portion 3, which slides and rotates between saidfifth stationary plate 22 of said movable portion 2 and said firststationary plate 14 of said stationary portion 1. Said first stationaryshaft 11 has a clearance fit with a sleeve 23 arranged to said fifth andsixth stationary plate 22, 29 of said movable portion 2, said secondstationary shaft 12 has a clearance fit with a sleeve 23 arranged tosaid fifth and sixth stationary plate 22, 29 of said movable portion 2,said movable shaft 13 has a clearance fit with a sleeve 23 arranged tosaid fifth and sixth stationary plate 22, 29 of said movable portion 2.Said movable portion 2 only has one axial freedom with respect to saidstationary portion 1 because of an arrangement of said first and secondstationary shaft 11, 12, that is to say that said movable portion 2 onlyslides axially to be good for busbars connecting correctly.

Referring to FIG. 8 to FIG. 10, said limiting portion 24 comprises abase 47, a straight pin 45 which has an interference fit with said base47, a limiting end 46 for partly inserting into said base 47, a spring42 for replacing said limiting end 46, a side cover 41 fixedly connectedto said limiting end 46 and and ball head for operating. Said side coveris fastened to said base 47 by snap-fits, said limiting end 46 comprisesa tooth 44 meshing with a teeth groove of said clamping portion 27, saidtooth 44 comprises a recess 48 matching with said straight pin 45,operating said ball head 41 is to release a meshing between said tooth44 and said teeth groove of said clamping portion 27, spring 42 actingon said tooth 44 is to rebuild a meshing between said tooth 44 and saidteeth groove, a matching between a recess arranged to said tooth 44 anda straight pin 45 is good for a correct meshing between said tooth 44and said teeth groove. Said limiting end 46 limits a movement of saidclamping portion 27 when said tooth 44 meshes with said teeth groove,said limiting end 46 does not limit a movement of said clamping portion27 when said tooth 44 does not mesh with said teeth groove, saidclamping portion 27 moves under outer force effecting. Said firststationary shaft 11 is fixedly connected to said first stationary plate14 by a straight pin 45, said second stationary shaft 12 is fixedlyconnected to said first stationary plate 14 by a straight pin 45, saidfirst stationary shaft 11 is fixedly connected to said second stationaryplate 16 by a straight pin 45, said second stationary shaft 12 isfixedly connected to said second stationary plate 16 by a straight pin45, see FIG. 6. Said movable shaft 13 is rotatably connected to saidfirst stationary plate 14 by a sleeve.

Referring to FIG. 5 and FIG. 7, said first stationary shaft 11 isfixedly connected to said third stationary plate 19 by a spring pin 45,said second stationary shaft 12 is fixedly connected to said thirdstationary plate 19 by a spring pin 45. Ends of said first and secondshaft 11, 12 are fixedly connected by said third stationary plate 19 toincrease rigidity of said stationary portion 1, such arrangement is goodfor said movable portion 2 to slide smooth along said first and secondstationary shaft 11, 12.

Process of busbars connecting is described as follows.

Referring to FIG. 11, inserting said first positioning pillar 111 ofsaid stationary portion 1 into a positioning hole preprocessed to afirst busbar is to make said fourth stationary plate 110 of saidstationary portion 1 fit with said first busbar. Sliding movable portion1 to a first position where said movable portion 2 fits with said thirdstationary plate 19 of said stationary portion 1. Operating said ballhead 49 is to manually adjust said clamping portion 27 to make saidclamping portion 27 move to a position to clamp a second busbar.Rotating said loading portion 3 to a position where is convenient toload connecting rods and keep said loading portion 3 at an open status.

Referring to FIG. 12, centrally placing connecting rods into saidreceiving cavity of said loading portion 3.

Referring to FIG. 13, closing said movable plates of said loadingportion 3, said loading portion 3 keeps at a close status because of amagnetic element arranged to said movable plates.

Referring to FIG. 14, rotating said loading portion 3 with connectingrods already mounted is to align connecting rods with preprocessed holesof said first busbar.

Referring to FIG. 15, inserting said second positioning pillar 25 ofsaid movable portion 2 into a positioning hole preprocessed to saidsecond busbar is to make said seventh stationary plate 28 of saidmovable portion 2 fit with said second busbar.

Referring to FIG. 16, operating said ball head 49 is to manually adjustsaid clamping portion 27 to make said clamping portion 27 clamp a secondbusbar. Adjusting positions of said first and second heating portion 17,26 is to make heating surfaces fit with busbars. Simultaneouslyactivating relative buttons of two handles is to make said first andsecond heating portion 17, 26 simultaneously heat said busbar with acertain period of time.

Referring to FIG. 17, after heating process, a diameter of saidpreprocessed hole of a busbar is greater than a diameter of saidconnecting rod because of a heat expansion and contraction so that saidconnecting rods are convenient to mount to said preprocessed holes.Simultaneously activating relative buttons of two handles is to makesaid electric motor drive unit 15 work, said movable portion 2 movesfrom a first position to a second position so as to make said connectingrods insert into said first and second busbars.

Referring to FIG. 18, after said connecting rods are partly insertinginto said first and second busbars, pushing said sliding block of saidsupporting portion 18 of said stationary portion 1 is to make saidsupporting end protrude from said stationary portion 1, said loadingportion 3 is kept at an open status to avoid said first and secondbusbars sticking said loading portion 3 when connecting busbars.

Referring to FIG. 19, continue activating relative buttons until saidfirst and second busbars are totally fit with each other, that is to saythat relative buttons are stopped activating when said movable portion 2is at said second position.

Referring to FIG. 20, operating said ball head 49 is to manually adjustsaid clamping portion 27 to make said clamping portion 27 release saidsecond busbar after busbars are cooled. Removing a power busbarconnection tool after mounting said connecting rods and connectingbusbars successfully, see FIG. 21.

Embodiment 2

Electric motor drive unit 15 in embodiment 1 is replaced by a pneumaticmotor drive unit, a compressing air releasing unit is simultaneouslyarranged to cool busbars after heating, air used for said pneumaticcylinder antriebseinheit and said compressing air releasing unit issupplied through an air input 5.

Referring to FIG. 22, a power busbar connection tool comprises apneumatic motor drive unit and an electric control unit connected withan electrical power input, a stationary portion 1 removably connected toa busbar, a movable portion 2 removably connected to a busbar and aloading portion 3 for clamping connecting rods. Said movable portion 2is movably connected to a first and second stationary shaft 11, 12 ofsaid stationary portion 1, said movable portion 2 is connected to amovable shaft 13 by a screw pair, said movable portion 2 is fixedlyconnected to said pneumatic motor drive unit of said stationary portion1, said movable shaft 13 is driven to rotate around its axis by saidpneumatic motor drive unit, said loading portion 3 is movably connectedto said second stationary shaft 12 of said stationary portion 1 andslides between a body of said stationary portion 1 and a body of saidmovable portion 2, said loading portion 3 rotates around said secondstationary shaft 12. Said air input 5 is connected to an outercompressing air source.

Embodiment 3

Electric motor drive unit 15 in embodiment 1 is replaced by an hydraulicmotor drive unit, a compressing air releasing unit is simultaneouslyarranged to cool busbars after heating, air used for said compressingair releasing unit is supplied through an air input 5.

Referring to FIG. 22, a power busbar connection tool comprises anhydraulic motor drive unit and an electric control unit connected withan electrical power input, a stationary portion 1 removably connected toa busbar, a movable portion 2 removably connected to a busbar and aloading portion 3 for clamping connecting rods. Said movable portion 2is movably connected to a first and second stationary shaft 11, 12 ofsaid stationary portion 1, said movable portion 2 is connected to amovable shaft 13 by a screw pair, said movable portion 2 is fixedlyconnected to said hydraulic motor drive unit of said stationary portion1, said movable shaft 13 is driven to rotate around its axis by saidhydraulic motor drive unit, said loading portion 3 is movably connectedto said second stationary shaft 12 of said stationary portion 1 andslides between a body of said stationary portion 1 and a body of saidmovable portion 2, said loading portion 3 rotates around said secondstationary shaft 12. Said air input 5 is connected to an outercompressing air source.

What is claimed is:
 1. A power busbar connection tool comprising: anelectric motor drive unit (15), and an electric control unit connectedwith an electrical power input; wherein said tool further comprising: astationary portion (1) removably connected to a first busbar, a movableportion (2) removably connected to a second busbar, and a loadingportion (3) for clamping a connecting rod; said connecting rod toassemble into a pre-hole on a connecting surface of said first andsecond busbars being used to connect said first busbar with said secondbusbar, said movable portion (2) being movably connected to a first andsecond stationary shaft (11,12) of said stationary portion (1), saidmovable portion (2) being connected to a movable shaft (13) by a screwpair, said movable portion (2) being fixedly connected to said electricmotor drive unit (15) of said stationary portion (1), said movable shaft(13) being driven to rotate around its axis by said electric motor driveunit (15), said loading portion (3) being movably connected to saidsecond stationary shaft (12) of said stationary portion (1) and slidingbetween a body of said stationary portion (1) and a body of said movableportion (2), said loading portion (3) rotating around said secondstationary shaft (12); said stationary portion (1) comprising said firststationary shaft (11), said second stationary shaft (12) parallel tosaid first stationary shaft (11), said movable shaft (13) parallel tosaid first stationary shaft (11), a first stationary plate (14)perpendicular to and fixedly connected to said first and secondstationary shaft (11,12), a second stationary plate (16) perpendicularto and fixedly connected to said first and second stationary shaft(11,12), said electric motor drive unit (15) arranged between said firstand second stationary plate (14,16), a third stationary plate (19)perpendicular to and fixedly connected to said first and secondstationary shaft (11,12), a fourth stationary plate (110) perpendicularto and fixedly connected to said first and second stationary plate(14,16), a first positioning pillar (111) arranged to said fourthstationary plate (110) for inserting into a positioning hole of saidfirst busbar; said movable shaft (13) being fixedly connected to arotating shaft of said electric motor drive unit (15) by a coupler(112).
 2. The power busbar connection tool according to claim 1, whereinsaid movable portion (2) comprising a seventh stationary plate (28), afifth stationary plate (22) perpendicular to and fixedly connected tosaid seventh stationary plate (28), a sixth stationary plate (29)perpendicular to and fixedly connected to said seventh stationary plate(28), a second positioning pillar (25) arranged to said seventhstationary plate (28) for inserting into a positioning hole of saidsecond busbar, a screw nut (21) arranged to said fifth stationary plate(22) for coupling with a screw portion of said movable shaft (13), aclamping portion (27) for clamping said second busbar arranged betweensaid fifth and sixth stationary plate (22,29) and through said sevenstationary plate (28), a limiting portion (24) arranged to said sevenstationary plate (28) for limiting said clamping portion (24) to move;said loading portion (3) comprising two movable plates whichrespectively open or close with respect to an axis of said secondstationary shaft (12), said movable plate comprising a receiving cavityfor receiving connecting rods.
 3. The power busbar connection toolaccording to claim 2, wherein said stationary portion (1) furthercomprising a first heating portion (17) arranged to said fourthstationary plate (110) for heating said first busbar, said first heatingportion (17) movably connecting to said fourth stationary plate (110) toadjust a distance between said first heating portion (17) and said firstbusbar; said movable portion (2) further comprising a second heatingportion (26) arranged to said seventh stationary plate (28) for heatingsaid second busbar, said second heating portion (26) movably connectingto said seventh stationary plate (28) to adjust a distance between saidsecond heating portion (26) and said second busbar.
 4. The power busbarconnection tool according to claim 3, wherein said stationary portion(1) further comprising a supporting portion (18) for supporting aloading portion (3), a supporting end of said supporting portion (18)penetrating through a first stationary plate (14), a length of saidsupporting end protruding from said first stationary plate (14) beingadjusted by a sliding block of said supporting portion (18).
 5. Thepower busbar connection tool according to claim 2, wherein said limitingportion (24) comprising a base (47), a straight pin (45) which has aninterference fit with said base (47), a limiting end (46) for partlyinserting into said base (47), a spring (42) for replacing said limitingend (46), a side cover (41) fixedly connected to said limiting end (46)and a ball head (49) for operating; said side cover (41) being fastenedto said base (47) by snap-fits, said limiting end (46) comprising atooth (44) for meshing with a teeth groove of said clamping portion(27), said tooth (44) comprising a recess (48) for matching with saidstraight pin (45), operating said ball head (49) being to releasemeshing between said tooth (44) and said teeth groove of said clampingportion (27), said spring (42) acting on said tooth (44) to make saidtooth (44) mesh with said teeth groove.
 6. The power busbar connectiontool according to claim 2, wherein said first stationary shaft (11)fixedly connecting to said first stationary plate (14) by a firststraight pin, said second stationary shaft (12) fixedly connecting tosaid first stationary plate (14) by a second straight pin, said movableshaft (13) being rotatably connected to said first stationary plate (14)by a sleeve, said first stationary shaft (11) fixedly connecting to saidsecond stationary plate (16) by a third straight pin, said secondstationary shaft (12) fixedly connecting to said second stationary plate(16) by a fourth straight pin.
 7. The power busbar connection toolaccording to claim 2, wherein said first stationary shaft (11) fixedlyconnecting to said third stationary plate (19) by a first spring pin,said second stationary shaft (12) fixedly connecting to said thirdstationary plate (19) by a second spring pin, said movable shaft (13)being rotatably connected to said third stationary plate (19) by asleeve.